Application method of hammering closing technology for fatigue crack of steel bridge
A technology of fatigue cracks and application methods, which is applied in the direction of bridges, bridge materials, bridge maintenance, etc., can solve the problems of operability limitations, limitations of methods for repairing fatigue cracks of steel bridges, failure to improve fatigue strength, etc.
Active Publication Date: 2014-07-30
HOHAI UNIV
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Problems solved by technology
[0004] Due to the complex structure and stress of steel bridges, the locations and forms of fatigue cracks are also various, and the methods for repairing fatigue cracks in steel bridges are relatively limited.
Commonly used methods include crack relief hole method, crack welding method, steel plate reinforcement method, etc., but these methods have their own characteristics and operability limitations, and can only delay cracking and cannot improve fatigue strength
Method used
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Embodiment 1
[0028] Such as figure 1 , figure 2 As shown, the equipment required for the application method of the steel bridge fatigue crack hammer closure technology is a pneumatic hammer 1 , a striker 2 , an air compressor 3 , and an air duct 4 . The air compressor 3 provides power to the pneumatic hammer 1, and the pneumatic hammer 1 drives the striker 2 to perform the hammering movement. The applicable condition of the fatigue crack hammering closure technology is that the fatigue crack 7 with an open surface is subjected to the first hammering treatment 8a along the cracking direction of the fatigue crack 7 to form a fatigue crack 7a which is initially closed on the surface, and then the first hammering treatment Next to 8a, the second hammering treatment 8b is performed to form a completely closed fatigue crack 7b on the surface. The length of each hammering treatment must exceed the edge of the fatigue crack by T cm (T is the thickness of the steel plate). Through the method of...
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The invention discloses an application method of a hammering closing technology for a fatigue crack of a steel bridge. Before the generating of the fatigue crack of the steel bridge, prevention is performed through a hammering load exerting way; after the generating of the fatigue crack of the steel bridge, repairing is performed through the hammering load exerting way; the hammering load is exerted through the hammering of a firing pin mounted at the power output end of a pneumatic hammer; when the fatigue crack of the steel bridge is repaired by hammering, the length treated through hammering exceeds the edge of the fatigue crack by Tcm, and the T represents the thickness of a steel plate on the steel bridge at generating part of the fatigue crack. Therefore, a corresponding fatigue crack repairing and preventing step and method can be provided for the actual steel bridge fatigue crack. Due to hammering treatment performed before cracking, the fatigue strength of a treated part is improved. After cracking, through repeated hammering treatments, the opening of the fatigue crack is closed, the stress intensity factor at a crack sharp end can be changed, the residual life of the fatigue crack is prolonged, and a repairing effect is achieved.
Description
technical field [0001] The invention belongs to the field of bridge maintenance, and in particular relates to an application method of hammering closure technology for fatigue cracks of steel bridges. Background technique [0002] With the rapid development of the economy, in order to meet the needs of the rapid growth of traffic, my country has built a number of long-span bridges. Long-span bridges require smaller structural weight and higher structural strength, while steel bridges have the advantages of light weight, high strength, and convenient fabrication and construction, and have been widely used in bridge construction. [0003] The overall service life of steel bridges in my country is not long, but some bridges have been in service for more than ten years. Due to the incomplete design theory of bridges and the lack of structural measures, coupled with the increasing traffic year by year, under the repeated action of vehicle loads, fatigue cracks are prone to occur...
Claims
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Inventor 吉伯海袁周致远傅中秋程苗
Owner HOHAI UNIV